Sega Master System / Mark III / Game Gear
For these games, each ROM is 128KB, 256KB or 512KB in size and uses mapping in slot 2. The first 32KB of the ROM is always mapped into Z80 address space at $0000 - $7fff. The remainder of the ROM is composed of 6, 14 or 30 banks, each 16KB in size. These banks are mapped, one at a time, into Z80 address space at $8000 - $bfff. This matches the memory map shown in the official SMS documentation for a 128KB "Mega"(bit) cartridge.
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